package thread;

import java.util.*;

public class SyncApiDemo2 {
    public static void main(String[] args) {
        //Collection<Integer> c = new ArrayList<>();
        //Collection<Integer> c = new LinkedList<>();
        //Collection<Integer> c = new HashSet<>();
        //将集合或Map转换为并发安全的，可以使用Collections的对应方法
        Collection<Integer> c = Collections.synchronizedList(new ArrayList<>());
        Thread t1 = new Thread(){
            public void run(){
                for (int i = 0; i <1000 ; i++) {
                   c.add(i);
                }
            }
        };
        Thread t2 = new Thread(){
            public void run(){
                for (int i = 1000; i < 2000; i++) {
                }
            }
        };
        t1.start();
        t2.start();

        try {
            Thread.sleep(50);
        } catch (InterruptedException e) {
        }

        System.out.println(c.size());
    }
}
